$ dmesg | tail
[25300713.878456] end_request: I/O error, dev vda, sector 2019854
[25300713.882430] Aborting journal on device dm-0-8.
[25300713.969861] end_request: I/O error, dev vda, sector 1965862
[25300713.972127] Buffer I/O error on device dm-0, logical block 196608
[25300713.973351] lost page write due to I/O error on dm-0
[25300713.973450] JBD2: I/O error detected when updating journal superblock for dm-0-8.
[25300746.138426] EXT4-fs error (device dm-0): ext4_journal_start_sb:327: Detected aborted journal
[25300746.139792] EXT4-fs (dm-0): Remounting filesystem read-only
[25387373.536038] EXT4-fs (dm-0): error count: 2
[25387373.536043] EXT4-fs (dm-0): initial error at 1407997573: ext4_journal_start_sb:327
[25387373.536047] EXT4-fs (dm-0): last error at 1407997573: ext4_journal_start_sb:327
[25473881.056039] EXT4-fs (dm-0): error count: 2
[...]

ssh username@ip  "mysqldump -u user -ppwd db" > ~/Bureau/db.sql